'Arrow' Season 2, episode 19 promo: Oliver takes the fight to Slade in 'The Man Under the Hood'

"Arrow" fans may need to get ready for an all-out war in the upcoming Season 2 episode "The Man Under the Hood." With Slade Wilson readying an army of mirakuru-infused criminals to help him destroy Oliver and the city, it's time for Team Arrow to take the fight to their enemy.

Get some tantalizing glimpses of that fight in the extended promo video for the episode.

While "The Man Under the Hood" also marks a bit of a "Flash" crossover, guest actors Danielle Panabaker and Carlos Valdes, do not feature in any prominent way in this video. Instead, it shows a lot of footage of Oliver and his friends -- Felicity included this time -- suiting up and heading out to take on Slade.

The now-definitely-evil Isabel Rochev and Laurel Lance (who has been told about Oliver by Slade) make appearances as well.

Whatever happens in this episode, it's going to be one heck of a fight.

"The Man Under the Hood" airs Wednesday, April 16 at 8 p.m. ET/PT on The CW.